LM431: Regarding Cathode Continuous Current and Cathode Current

Hi Walter,

Thank you for your reply.

I understand.

I'll share your answer with the customer.

When the customer has an additional question, I consult you again.

I appreciate your great help and cooperation.

Best regards,

Shinichi

Hi Walter,

The customer has an additional question.

Could you please advise?

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Is it acceptable for short-term inrush current or surge current to exceed the value of Continuous cathode current?

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I appreciate your great help and cooperation.

Best regards,

Shinichi

Hi Walter,

Thank you for your reply.

I could obtain the waveform of inrush current from the customer.

Is this waveform acceptable?

Vertical: 100mA/div, Horizontal: 200us/div

I appreciate your great help and cooperation.

Best regards,

Shinichi

Hi Walter,

Thank you for your reply.

I understand that it is not recommended because current exceeding the absolute maximum rating is repeatedly input.

When they have an additional question, I consult you again.

I appreciate your great help and cooperation.

Best regards,

Shinichi

Hi Walter,

The customer has an additional request.

Could you please advise whether LM431 can be used.

20mA/div 200us/div

I appreciate your great help and cooperation.

Best regards,

Shinichi

Hi Walter,

Thank you for your reply.

I'll answer it is still not recommended to the customer.

Could you please let me know if there are any criteria(number of times, current ,pulse width) for determining when the absolute maximum ratings are exceeded.

What conditions must be met to determine that it can be used?

I appreciate your great help and cooperation.

Best regards,

Shinichi

Hi Walter,

Thank you for your reply.

There are no guidelines when exceeding the absolute maximum ratings.

I will ask the customer to consider changing the circuit.

I appreciate your great help and cooperation.

Best regards,

Shinichi